Oleksandra Sokolova

Oleksandra, also known as "Alex" and "Sasha", among other names, has been somewhat of a mystery.
When Feliks's mom was murdered a few years ago, all evidence pointed to her.
Nevertheless, Feliks trusted her and helped her escape, and the two have been estranged ever since.
Until, that is, she kidnapped Fina... Who observed her acting strangely, as if she wasn't always in control of her own actions.
When they captured her, the party found an egg sac behind her ear, and destroyed it...
Still, answers are evasive. The party didn't get a chance to question her, since she died fighting the River Revenant to protect Star...